/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

#pragma once

/** \file
 * \ingroup freestyle
 * \brief Class to build a Node Tree designed to be displayed from a Silhouette View Map structure.
 */

#include "Silhouette.h"
#include "ViewMap.h"

#include "../scene_graph/LineRep.h"
#include "../scene_graph/NodeGroup.h"
#include "../scene_graph/NodeShape.h"
#include "../scene_graph/OrientedLineRep.h"
#include "../scene_graph/VertexRep.h"

#include "../winged_edge/WEdge.h"

#ifdef WITH_CXX_GUARDEDALLOC
#  include "MEM_guardedalloc.h"
#endif

namespace Freestyle {

class NodeShape;
class NodeGroup;
class SShape;
class WShape;

class ViewMapTesselator {
 public:
  inline ViewMapTesselator()
  {
    _nature = Nature::SILHOUETTE | Nature::BORDER | Nature::CREASE;
    _FrsMaterial.setDiffuse(0, 0, 0, 1);
    _overloadFrsMaterial = false;
  }

  virtual ~ViewMapTesselator() {}

  /** Builds a set of lines rep contained under a NodeShape, itself contained under a NodeGroup
   * from a ViewMap */
  NodeGroup *Tesselate(ViewMap *iViewMap);

  /** Builds a set of lines rep contained under a NodeShape, itself contained under a NodeGroup
   * from a set of view edges
   */
  template<class ViewEdgesIterator>
  NodeGroup *Tesselate(ViewEdgesIterator begin, ViewEdgesIterator end);

  /** Builds a set of lines rep contained among a NodeShape, from a WShape */
  NodeGroup *Tesselate(WShape *iWShape);

  inline void setNature(Nature::EdgeNature iNature)
  {
    _nature = iNature;
  }

  inline void setFrsMaterial(const FrsMaterial &iMaterial)
  {
    _FrsMaterial = iMaterial;
    _overloadFrsMaterial = true;
  }

  inline Nature::EdgeNature nature()
  {
    return _nature;
  }

  inline const FrsMaterial &frs_material() const
  {
    return _FrsMaterial;
  }

 protected:
  virtual void AddVertexToLine(LineRep *iLine, SVertex *v) = 0;

 private:
  Nature::EdgeNature _nature;
  FrsMaterial _FrsMaterial;
  bool _overloadFrsMaterial;

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:ViewMapTesselator")
#endif
};

/** Class to tessellate the 2D projected silhouette */
class ViewMapTesselator2D : public ViewMapTesselator {
 public:
  inline ViewMapTesselator2D() : ViewMapTesselator() {}
  virtual ~ViewMapTesselator2D() {}

 protected:
  virtual void AddVertexToLine(LineRep *iLine, SVertex *v)
  {
    iLine->AddVertex(v->point2D());
  }

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:ViewMapTesselator2D")
#endif
};

/** Class to tessellate the 3D silhouette */
class ViewMapTesselator3D : public ViewMapTesselator {
 public:
  inline ViewMapTesselator3D() : ViewMapTesselator() {}
  virtual ~ViewMapTesselator3D() {}

 protected:
  virtual void AddVertexToLine(LineRep *iLine, SVertex *v)
  {
    iLine->AddVertex(v->point3D());
  }

#ifdef WITH_CXX_GUARDEDALLOC
  MEM_CXX_CLASS_ALLOC_FUNCS("Freestyle:ViewMapTesselator3D")
#endif
};

//
// Implementation
//
///////////////////////////////////////////////

template<class ViewEdgesIterator>
NodeGroup *ViewMapTesselator::Tesselate(ViewEdgesIterator begin, ViewEdgesIterator end)
{
  NodeGroup *group = new NodeGroup;
  NodeShape *tshape = new NodeShape;
  group->AddChild(tshape);
  // tshape->frs_material().setDiffuse(0.0f, 0.0f, 0.0f, 1.0f);
  tshape->setFrsMaterial(_FrsMaterial);

  LineRep *line;

  FEdge *firstEdge;
  FEdge *nextFEdge, *currentEdge;

  // for (vector<ViewEdge*>::const_iterator c = viewedges.begin(), cend = viewedges.end(); c !=
  // cend; c++)
  for (ViewEdgesIterator c = begin, cend = end; c != cend; c++) {
#if 0
    if ((*c)->qi() > 0) {
      continue;
    }
    if (!((*c)->nature() & (_nature))) {
      continue;
    }
#endif
    firstEdge = (*c)->fedgeA();

#if 0
    if (firstEdge->invisibility() > 0) {
      continue;
    }
#endif

    line = new OrientedLineRep();
    if (_overloadFrsMaterial) {
      line->setFrsMaterial(_FrsMaterial);
    }

    // there might be chains containing a single element
    if (0 == (firstEdge)->nextEdge()) {
      line->setStyle(LineRep::LINES);
      // line->AddVertex((*c)->vertexA()->point3D());
      // line->AddVertex((*c)->vertexB()->point3D());
      AddVertexToLine(line, firstEdge->vertexA());
      AddVertexToLine(line, firstEdge->vertexB());
    }
    else {
      line->setStyle(LineRep::LINE_STRIP);

      // firstEdge = (*c);
      nextFEdge = firstEdge;
      currentEdge = firstEdge;
      do {
        // line->AddVertex(nextFEdge->vertexA()->point3D());
        AddVertexToLine(line, nextFEdge->vertexA());
        currentEdge = nextFEdge;
        nextFEdge = nextFEdge->nextEdge();
      } while ((nextFEdge != nullptr) && (nextFEdge != firstEdge));
      // Add the last vertex
      // line->AddVertex(currentEdge->vertexB()->point3D());
      AddVertexToLine(line, currentEdge->vertexB());
    }

    line->setId((*c)->getId().getFirst());
    line->ComputeBBox();
    tshape->AddRep(line);
  }

  return group;
}

} /* namespace Freestyle */
